Shears



Sept. 29, 1925. i 1,555,286

1?. R. HOGG SHEAR S Filed may 2, 1922 hwsu'ron T- 3 1 99 Patented Sept. 29, 1925.

UNITED STATES PATENT OFFICE.

smnms.

Application filed May 2,

To all whom it may concern Be it known that I, THOMAS RUTHERFORD Hoes, of the city of Regina, in the Province of Saskatchewan, Canada, have invented certain new and useful Improvements in Shears, of which the following is the specification.

The invention relates to improvements in shears or scissors and an object of the invention is to provide means whereby the pivoted shear blades are pressed closely together in proper cutting relationship throughout their length and whereby the pressure of the blades upon each other may be regulated to the greatest nicety and locked when so regulated.

A further object of the invention is to provide an adjustable pivot connection for the blades which is particularly simple, inexpensive to manufacture and easy to adjust, and which presents no projecting parts which might catch threads, ravellings, or other things when the scissors are in use.

A still further object is to provide. a pivot fastening which can be adjusted and locked and which embodies as part thereof the ordinary pivot bolt as used on scissors, such permitting of the application of my invention without having to alter the blades at the pivot in any way, nor the type of pivot screw employed.

With the above more important objects in view the invention consists essentially in the arrangement and construction of parts here inafter more particularly described and later pointed out in the appended claim, reference being had to the accompanying drawing in which:

Fig 1 "is a plan view of apair embodying my invention.

Fig. 2 is an enlarged detailed vertical sectional view at 22 Fig. 1.

Fig. 3 is a side view of the pivot bolt.

Figs. l and 5 are views of the opposite ends of the bolt.

Fig. 6 is a side view of the lock screw.

In the drawing like characters of reference indicate corresponding parts in the several figures.

The shears or scissors 1 can, so far as the general construction is concerned, be of any usual kindthat; isthe blades and handles may be of any usual style, size, or quality.

The blades 2 and 3 are held in the usual general relation to each other, being pivotally connected by the pivot bolt 4. This pivot bolt for the greater part is of the ordinary of shears j 1922. Serial No. 557,912.

' construction, having one end formed 'intoia flat head 5 and the other end externally screw threaded as indicated at 6 to screw into the receiving internal screw threads of the blade 2. The head 5 is counter sunk in the blade 3 in the ordinary manner and is provided with a cross slot 7 which is utilized to permit of the tightening of the bolt by the application of a screw driver.

The bolt as above described is of ordinary construction, being now used on scissors which are sold. It is a well known fact, however, that a nicety of adjustment cannot be had with this type of bolt for the reason that it has a tendency to tighten up or loosen when the scissors are in use.

In order to permit of the locking of the bolt when the same has been adjusted to a nicety I make a certain improvement in the bolt structure, as shortly described, and provide a locking screw, used in conjunction with the bolt.

The bolt: is centrally drilled to provide a central opening or hole 8 which may pass all the way or partially through the same and at the end of the bolt remote fro-m the head I made a tapering counter sink 9 and also internally screw thread the same, as indicated at 10, at such end. The said end is also cross slotted, as indicated at 11. In actual practice there may be a number of cross slots as in the larger or heavier types of shears it has been. found that a greater number of cross slots are required in order toallow the said end of the bolt to expand under the influence of the locking screw.

The locking screw 12 has the inner end thereof screw? threaded to fit the threads 10 and the outer end thereof provided with-a tapering head 13 supplied with a cross slot 14. The tapering head is adapted to enter the tapering counter sink 9 and the cross slot is sup-plied so that the said screw can be tightened up by utilizing a screw driver.

From the above description it will be apparent that the locking bolt of an ordinary pair of scissors or shears can be readily converted into my special bolt and that having done this it is only necessary to provide the locking screw.

This feature is important, as it allows a manufacturer to convert the shears of the ordinary type, which he is manufacturing, into my type, without having to scrap the bolts employed or change the shear form at the pivot point.

The shears are adjusted by primarily seeing that the lock screw is released in order to allow the bolt to be tightened up to hold the shears in proper cutting relation, one in respect to the other. Then this is done the lock screw is tightened up and the tapering end thereof expands the slotted or split end of the bolt and actually locks the bolt to the shear 2. i

The Whole structure is particularly neat, inexpensive, and effective.

What I claim as my invention is;

The combination with a pair of shears or scissor blades, of a locking bolt pivotally connecting the blades and having one end adjustably screw threaded into one of the blades and the other end pivot-ally support ing the other of the blades and having the screw threaded end cross slotted and provided With a central lengthwise extending screw threaded opening and With the outer end of the said opening counter sunk and a locking screw screw threading into the latter opening and provided With a tapering head engageable with the counter sink in the bolt to expand the threads of the bolt against the engaging threads of the blade.

Signed at Regina this 26th day of April 1922.

THQMAS RUTHERFORD HOGG. 

